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Abiotic Factors (GCSE Biology)

The following is a GCSE Biology test covering 'Abiotic Factors' from the broader topic Ecology. The test is geared towards the AQA exam board style syllabus.
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A student measures dissolved oxygen in a stream to assess water quality. Which abiotic factor will most reduce dissolved oxygen?
Which abiotic factor would most likely be the limiting factor for a plant growth experiment performed inside a sealed jar?
Which abiotic factor would ecologists measure to estimate potential for soil compaction and root penetration?
Which abiotic factor commonly limits algal growth in deep lakes where light cannot penetrate?
Which abiotic factor often causes stomata to close to reduce transpiration?
In a river, turbidity is an abiotic factor. What does high turbidity indicate?
Which abiotic factor would most affect which species can survive on a mountaintop compared with valley floors?
In an experiment on aquatic plants, which abiotic factor would you change to investigate its effect on gas bubble production as a measure of photosynthesis?
In a coastal estuary, which abiotic factor fluctuates daily and strongly affects which species can live there?
Soil pH is an abiotic factor. Which plant nutrient availability is commonly affected by soil pH?
Salt concentration in soil is an abiotic factor. How will very high soil salinity most directly affect plant cells?